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West Nile virus is currently found in many areas of the eastern half of the United States. The virus is spread by the bite of an infected mosquito, and can infect people, horses, many types of birds, and some other animals.

Most people who become infected with West Nile virus will have either no symptoms or only mild ones. On rare occasions, infection can result in a severe and sometimes fatal illness known as West Nile encephalitis (an inflammation of the brain). The risk of severe disease is higher for persons 50 years of age and older. As of August 6, 2002, state health departments have released information on 89 cases of West Nile virus related human illness this year, including 4 deaths. From 1999 through 2001, there were 149 cases of West Nile virus human illness in the United States reported to CDC and confirmed, including 18 deaths.

There is no evidence to suggest that West Nile virus can be spread from person to person or from animal to person.

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